The Priva Compass has two independent curtain controls. The installer can set up one curtain control as a shading curtain control and one curtain control as an energy curtain control.
Each of these two curtain controls can control dual motors. The first curtain motor is simply called “curtain” and the second motor is called curtain B.
Often the dual curtains are used if there are two different curtain motors in a zone that achieve the same purpose but have different running times. For instance, an energy curtain may have both roof curtains and wall curtains. The controls would be almost the same except the wall curtain would have a different running time and the wall curtain would not need to be gapped for temperature and humidity control.
Another example is to have dual shading motors. This article gives an example of how a dual shading control would be set up.
Dual shading motors
In this example, we will assume that one of the shading curtains is mounted outside the greenhouse above the structure and the other shading curtain mounted inside the greenhouse. The inside curtain is referred to as curtain B.
The status screen would look something like this:
Shading Status | Curtain 1 (shading) | Curtain 2 (energy) |
Curtain position | 0% | 0% |
Curtain status | Uncovered | Uncovered |
Curtain B position | 0% | |
Curtain B status | Uncovered |
We want to set up the curtain control for shading. In this example we will have four different levels of shading.
- Level 1 – The outside curtain is 50% covered and the inside curtain is uncovered
- Level 2 – The outside curtain is 100% covered and the inside curtain is uncovered
- Level 3 – The outside curtain is 100% covered and the inside curtain is 50% covered
- Level 4 – The outside curtain is 100% covered and the inside curtain is 90% covered
General setup
The curtains will cover the greenhouse if the light intensity is too high or if the greenhouse is too warm.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Number of shading levels | 4 | 0 |
Shading control | Sunlight and temperature |
We want both shading curtains uncovered if the light level is below 400 w/m2 and the temperature in the greenhouse is below 26°C.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
No shade(uncover) light intensity | 400 w/m2 | |
No shade (uncover) Temperature | 26° |
Level 1 shading
If the solar radiation gets above 450 w/m2 or if the outside temperature goes above 27°C, we want to go to shading level 1. To do so, we cover the outside curtain to 50% and we want to leave the inside curtain (curtain B) uncovered.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Shade level 1 sunlight intensity |
450 w/m2 |
|
Shade level 1 temperature |
27°C |
|
Shade level 1 curtain position |
50% |
|
Shade level 1 curtain B position |
0% |
Level 2 shading
If the solar radiation gets above 500 w/m2 or if the outside temperature goes above 28°C, we want to go to shading level 2. To do so, we cover the outside curtain to 100% and we want to leave the inside curtain (curtain B) uncovered.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Shade level 2 sunlight intensity |
500 w/m2 |
|
Shade level 2 temperature |
28°C |
|
Shade level 2 curtain position |
100% |
|
Shade level 2 curtain B position |
0% |
Level 3 shading
If the solar radiation gets above 550 w/m2 we want to go to shading level 3. To do so, we cover the outside curtain to 100% and we want to cover the inside curtain (curtain B) to 50%. We do not want to cover the inside curtain bases on temperature so we will set the temperature level very high.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Shade level 3 sunlight intensity |
500 w/m2 |
|
Shade level 3 temperature |
28°C |
|
Shade level 3 curtain position |
50% |
|
Shade level 3 curtain B position |
0% |
Level 4 shading
If the solar radiation gets above 6000 w/m2 we want to go to shading level 4. To do so, we cover the outside curtain to 100% and we want to cover the inside curtain (curtain B) to 90%. We do not want to cover the inside curtain bases on temperature so we will set the temperature level very high.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Shade level 4 sunlight intensity |
500 w/m2 |
|
Shade level 4 temperature |
28°C |
|
Shade level 4 curtain position |
50% |
|
Shade level 4 curtain B position |
0% |
Wind protection
If the wind speed gets above 10 m/s, we want to uncover the outside curtain. We do not want to uncover the inside curtain so we will set a very high wind speed for that curtain. Since we know that wind speed changes, if we go to wind protection mode, we want to stay there for 30 minutes.
The relevant settings screen would look something like this:
Shading Settings | Curtain 1 (shading) | Curtain 2 (energy) |
Uncover curtain if wind speed exceeds |
10 m/s |
|
Uncover curtain B if wind speed exceeds |
100 m/s |
|
Delay release of curtain after high wind |
0:30 |